Print Page - 5.0 HO Roller lifter pre-load

Title: 5.0 HO Roller lifter pre-load
Post by: The Shredder on November 08, 2011, 08:17:26 PM

Do you guys know how to figure out the correct length of push rods? I believe my pushrods are too short and causing some valvetrain noise.

Here is a picture of my rocker setup (1993 Cobra Crane rockers)...
(http://i71.photobucket.com/albums/i153/jdschrader/TurboCoupe/TC_Engine014.jpg)

(http://i71.photobucket.com/albums/i153/jdschrader/TurboCoupe/TC059.jpg)

I have the stock HO cam with stock roller lifters and 1993 GT40 heads and valves, but with TFS springs. I used the pushrods that cam from the same engine the fully assembled heads came from. It only had idle time.

I just ordered a Comp Cams adjustable pushrod to measure the length between the lifter and rocker arm.

But how do I work the adjustable pushrod? Zero lash is when I can't spin the pushrod? How much longer should the pushrod be from zero lash to pre-load the lifter?

Title: 5.0 HO Roller lifter pre-load
Post by: QUICKSHIFT on November 08, 2011, 09:43:53 PM

.....this may help with the pattern you are trying to attain by varying the push rod length.

http://sbftech.com/index.php/topic,317.0.html

Title: 5.0 HO Roller lifter pre-load
Post by: QUICKSHIFT on November 08, 2011, 09:54:12 PM

.....or this may be closer to your set up.

http://sbftech.com/index.php/topic,28993.0.html

Title: 5.0 HO Roller lifter pre-load
Post by: Shadow on November 08, 2011, 10:02:34 PM

^ gotta love sbf tech :)

Title: 5.0 HO Roller lifter pre-load
Post by: QUICKSHIFT on November 08, 2011, 10:25:08 PM

Hey Shredder, I hope that the noise that you hear is not a result of the rocker rubbing on the VC as indicated by the scuff marks on the part # of the rocker in the pic.

Title: 5.0 HO Roller lifter pre-load
Post by: The Shredder on November 09, 2011, 10:23:58 AM

Quickshift, the rocker rub mark is from the filler tube baffle.
(http://i71.photobucket.com/albums/i153/jdschrader/TurboCoupe/TC061.jpg)

All other rockers are FINE with no clearance problems.

Thanks for the links to sbftech. It appears that zero lash is no play between pushrod and rocker. Then about 0.020 - 0.060" pre-load. I'll get that measured up.

Title: 5.0 HO Roller lifter pre-load
Post by: Bruce M on November 09, 2011, 04:34:31 PM

Quote from: QUICKSHIFT;372373

Hey Shredder, I hope that the noise that you hear is not a result of the rocker rubbing on the VC as indicated by the scuff marks on the part # of the rocker in the pic.

Ya'll beat me to it.

Title: 5.0 HO Roller lifter pre-load
Post by: Shadow on November 09, 2011, 05:31:38 PM

.. i didn't even realize.. lmao

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Technical => Engine Tech => Topic started by: The Shredder on November 08, 2011, 08:17:26 PM